Doubly fed induction generator uising back-to-back PWM ...

Doubly fed induction generator uising back-to-back PWM converters and its application to variable- speed wind-energy generation R. Pena G. M. As her Indexing terms: Doubly fed induction motor, P WM converters, Vector control, Wind energy Abstract: The paper describes the engineering and design of a Doubly fed induction generator (DFIG), using back-to-back PWM voltage-source converters in the rotor circuit. A vector-control scheme for the supply-side PWM converter results in independent control of active and reactive power drawn from the supply, while ensuring sinusoidal supply currents. Vector control of the rotor-connected converter provides for wide speed-range operation; the vector scheme is embedded in control loops which enable optimal speed tracking for maximum energy capture from the wind. An experimental rig, which represents a kW variable speed wind- energy generation system is described, and experimental results are given that illustrate the excellent performance characteristics of the system.

The converters used are standard 7.5 kW commercial bipolar transistor PWM inverters with a rated DC-link voltage of 580V and a maximum switching frequency of 1 kHz. At this power level, the use of IGBT convert- ers would have allowed a higher switching frequency and would have eased some of the control-loop design.

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  Converter, Frequency

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